Abstract
The article presents the results of biochemical studies on the state of the antioxidant liver system of alien fish of the Samara Bay of the Zaporizke Reservoir (Dnipropetrovsk Region, Ukraine) on the example of the Prussian carp and pumpkinseed. The biochemical parameters, which indicate the essential sensitivity of the enzymatic activity of superoxide dismutase, catalase and glutathione peroxidase, as well as the level of malate dialdehyde in Prussian carp Carassius gibelio (Bloch, 1782), compared to the pumpkinseed Lepomis gibbosus (Linnaeus, 1758), are determined. The obtained results indicate an increase in the catalase and superoxide dismutase activity in the liver of experimental species of fish, which plays an important role in the consistent elimination of superoxide anion and hydrogen peroxide during the intensive metabolic transformations occurring in the tissue. It is noted that the activity of enzymes and levels of malondialdehyde depend on the state of the antioxidant system of fish, anthropogenic loading on the aquatic environment, the influence of many environmental factors, seasonality and nutrition of each alien species.
Highlights
In recent years, the works devoted to the study of oxidative stress in fish have discovered many areas of study of the physiology and biochemistry of fish
The intensity of the lipid oxidation (LPO) in the tissues can be determined by the accumulation of malonic dialdehyde (MDA), one of the end products of peroxide oxidation
Our studies have shown that the activity of glutathione peroxidase in the liver of Prussian carp and the pumpkinseed is slightly different in the fish of both species: for Prussian carp, this indicator was 3.8, and for the pumpkinseed it was 2.09 μMGSH min–1 * mg protein–1
Summary
The works devoted to the study of oxidative stress in fish have discovered many areas of study of the physiology and biochemistry of fish. Increasing the effectiveness of the antioxidant system in the fish organism in response to the intensification of peroxide lipid oxidation (LPO) is a normal mechanism for the elimination of LPO products and an important element of adaptation to environmental changes in the surrounding aquatic environment (Dudkin, 1990). Previous studies have allowed determining the mechanism of adaptation of reproductive systems of invasive species to reproduction in new conditions of existence, which allows effective reproducing and increasing its size, creating competition to aboriginal species and reducing fish productivity of reservoirs (Marenkov, 2016, 2018). It is known that during intense activity of an organism (migration, spawning, competition in the condition of existence) and other non-specific for fish effects (anthropogenic loading), there is an increase in oxidative processes, resulting in the accumulation of LPO products acting as the primary mediator of stress (Zenkov et al, 2001; Baraboy, 2006). The purpose of the work was to determine the adaptive capacities of the species-invaders by assessing the processes of oxidative stress in the liver tissues
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
